Subtract 3/72 from 40/21
1st number: 1 19/21, 2nd number: 3/72
40/21 - 3/72 is 313/168.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 21 × 24 = 504,
40/21 = 40 × 24/21 × 24 = 960/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
3/72 = 3 × 7/72 × 7 = 21/504 - Subtract the two like fractions:
960/504 - 21/504 = 960 - 21/504 = 939/504 - After reducing the fraction, the answer is 313/168
- In mixed form: 1145/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21-3/72 40/21-6/72 40/42-3/72 40/21-9/72 40/63-3/72 40/21-15/72 40/21-21/72